<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>页头</title>
    <link href="bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="page-header">
        <h1>Bootstrap学习<small>页头的学习</small></h1>
        <h2>Bootstrap学习<small>页头的学习</small></h2>
        <h3>Bootstrap学习<small>页头的学习</small></h3>
    </div>
</body>
</html>